1 / 29

Can you read what Mr Porter has written in your books?

Can you read what Mr Porter has written in your books?. Falling!. Imagine a dog being thrown out of an aeroplane. Woof! (help!). Force of gravity means the dog accelerates. To start, the dog is falling slowly (it has not had time to speed up).

felix
Download Presentation

Can you read what Mr Porter has written in your books?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Can you read what Mr Porter has written in your books?

  2. Falling!

  3. Imagine a dog being thrown out of an aeroplane. Woof! (help!)

  4. Force of gravity means the dog accelerates To start, the dog is falling slowly (it has not had time to speed up). There is really only one force acting on the dog, the force of gravity. The dog falls faster (accelerates) due to this force. gravity

  5. gravity Gravity is still bigger than air resistance Air resistance As the dog falls faster, another force becomes bigger – air resistance. The force of gravity on the dog of course stays the same The force of gravity is still bigger than the air resistance, so the dog continues to accelerate (get faster)

  6. Gravity = air resistanceTerminal velocity As the dog falls faster and air resistance increases, eventually the air resistance becomes as big as (equal to) the force of gravity. The dog stops getting faster (accelerating) and falls at constant velocity. This velocity is called the terminal velocity. Air resistance gravity

  7. Air resistance gravity Terminal Velocity The dog will continue to fall at constant speed (called the terminal speed) until…………. air resistance = gravity

  8. Air resistance gravity Terminal Velocity

  9. Oooooops!

  10. That definitely was terminal! YouTube - Moonraker Pre Credits

  11. Can you stick the sheet in? YouTube - Moonraker Pre Credits

  12. Falling without air resistance

  13. Falling without air resistance

  14. Falling without air resistance This time there is only one force acting in the ball - gravity gravity

  15. gravity Falling without air resistance The ball falls faster….

  16. gravity Falling without air resistance The ball falls faster and faster…….

  17. gravity Falling without air resistance The ball falls faster and faster and faster……. It gets faster by 10 m/s every second (10 m/s2) This number is called “g”, the acceleration due to gravity.

  18. Falling without air resistance Can you copy the words please? Without air resistance objects fall faster and faster and faster……. They get faster by 10 m/s every second (10 m/s2) This number is called “g”, the acceleration due to gravity. Where did I come from? gravity

  19. Let’s try a quick investigation Which falls fastest? Small ball Medium ball Big ball Design a results table FIRST!

  20. Falling without air resistance? distance time

  21. Falling without air resistance? distance time

  22. Falling without air resistance? speed time

  23. Falling without air resistance? speed time

  24. Falling without air resistance? speed Gradient = acceleration = 10 m/s2 time

  25. Falling with air resistance? distance time

  26. Falling with air resistance? distance time

  27. Falling with air resistance? Terminal speed speed time

  28. Falling with air resistance? speed time

  29. Let’s try some questions • Page 35 questions 1 and 2.

More Related